EP0729400B1 - Safety reset device - Google Patents
Safety reset device Download PDFInfo
- Publication number
- EP0729400B1 EP0729400B1 EP95901663A EP95901663A EP0729400B1 EP 0729400 B1 EP0729400 B1 EP 0729400B1 EP 95901663 A EP95901663 A EP 95901663A EP 95901663 A EP95901663 A EP 95901663A EP 0729400 B1 EP0729400 B1 EP 0729400B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- reset
- output
- input
- channel
- closed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16P—SAFETY DEVICES IN GENERAL; SAFETY DEVICES FOR PRESSES
- F16P3/00—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body
- F16P3/12—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine
- F16P3/14—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine the means being photocells or other devices sensitive without mechanical contact
- F16P3/144—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine the means being photocells or other devices sensitive without mechanical contact using light grids
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/002—Monitoring or fail-safe circuits
- H01H47/004—Monitoring or fail-safe circuits using plural redundant serial connected relay operated contacts in controlled circuit
- H01H47/005—Safety control circuits therefor, e.g. chain of relays mutually monitoring each other
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Electronic Switches (AREA)
- Debugging And Monitoring (AREA)
Description
Claims (9)
- A safety reset device intended for use together with a personal safety protection device, comprising a reset switch (3); means (11, 21) for generating a reset signal, said generating means being so arranged that the reset switch (3) must have been both closed and opened to generate said reset signal; two reset channels (1, 2), which each comprise an input (A; B) from the personal safety protection device, an output (14; 24), holding means (15; 25) for said output and starting means (13; 23) adapted to close the output and activate the holding means (15; 25) when a reset signal is received and the input (A; B) is closed, characterised in that at least the starting means (13; 23) and the holding means (15; 25) are completely made up of electronic components and that corresponding electronic components in the starting means and the holding means are substantially electronically mirror-inverted, such that, when a component closes to one pole of the supply voltage in one reset channel, the corresponding component in the other reset channel closes to the other pole of the supply voltage.
- A device as claimed in claim 1, characterised in that the means (11, 21) for generating a reset signal are completely made up of electronic components, and that each reset channel has its own means, separate from the other channel, for generating the reset signal.
- A device as claimed in claim 1 or 2, characterised in that the electronic components comprise a microprocessor in each reset channel (1, 2).
- A device as claimed in claim 2, characterised in that the means (11, 21) for generating a reset signal comprise a first capacitor (C100; C200), which is discharged and charged when the reset switch (3) is closed and opened, respectively, the degree of charge of the capacitor affecting the voltage over a first switch means (O100; O200) which is activated for a short time during the charging process for generating the reset signal.
- A device as claimed in any one of the preceding claims, characterised in that each of the reset channels (1, 2) further comprises a second switch means (T101; T201) adapted to receive the reset signal and being so connected to the input (A, B) from the personal safety protection device as to be caused to close by the reset signal when the input (A, B) is closed.
- A device as claimed in any one of the preceding claims, characterised in that each reset channel (1, 2) comprises current limiting means adapted to limit the current when the input from the personal safety protection device in one reset channel is short-circuited with the input from the personal safety protection device in the other reset channel so as to open the outputs (14, 24).
- A device as claimed in any one of the preceding claims, characterised in that the starting means (13; 23) contain sensor means for sensing the state of the output in the other channel, said sensing means being adapted to prevent closure of the output of its reset channel, if the output in the other reset channel has been closed more than a predetermined time when the reset signal is received.
- A device as claimed in claim 7, characterised in that said sensing means comprise a capacitor (C101; C201), which is charged when the output (24; 14) in the other reset channel is opened and which, when the input (A, B) from the personal safety protection device in its reset channel is closed and the reset signal is received, is discharged through a third switch means (O101; O201) which is adapted to close the output.
- A device as claimed in claim 8, characterised in that the holding means (15; 25) consist of an optocoupler (O102; O202), whose light-emitting diode is activated when the third switch means closes the output and whose transistor holds the output closed as long as the input from the personal safety device is closed.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9303785A SE502306C2 (en) | 1993-11-16 | 1993-11-16 | Security Recovery Device |
SE9303785 | 1993-11-16 | ||
PCT/SE1994/001079 WO1995013906A1 (en) | 1993-11-16 | 1994-11-16 | Safety reset device |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0729400A1 EP0729400A1 (en) | 1996-09-04 |
EP0729400B1 true EP0729400B1 (en) | 1998-08-05 |
Family
ID=20391768
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95901663A Expired - Lifetime EP0729400B1 (en) | 1993-11-16 | 1994-11-16 | Safety reset device |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0729400B1 (en) |
AU (1) | AU1081095A (en) |
DE (1) | DE69412280T2 (en) |
SE (1) | SE502306C2 (en) |
WO (1) | WO1995013906A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19626129C2 (en) * | 1996-06-28 | 2000-03-02 | Elan Schaltelemente Gmbh & Co | Safety circuit |
US20110308365A1 (en) * | 2008-04-24 | 2011-12-22 | Yuan Ze University | Safety device for machine tool |
DE102009014248B4 (en) * | 2009-03-20 | 2012-06-14 | Sumitomo (Shi) Demag Plastics Machinery Gmbh | Walk-in safety floor |
CN106313058B (en) * | 2016-11-09 | 2018-11-20 | 兰州大学 | A kind of steering engine control device of output multi-channel High-Accuracy PWM signal |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58213396A (en) * | 1982-06-05 | 1983-12-12 | 竹中エンジニアリング工業株式会社 | Ommateal type burglarproof sensor system |
US4818866A (en) * | 1986-01-13 | 1989-04-04 | Data Instruments, Inc. | Intrusion detection system for operating industrial machines with variable sensitivity |
ATE49800T1 (en) * | 1986-07-09 | 1990-02-15 | Tele Security Foto Ueberwachun | MACHINE PROTECTION CIRCUIT. |
SE465067B (en) * | 1988-03-24 | 1991-07-22 | Jokab Safety Ab | Production-adapted safety system |
WO1990008333A1 (en) * | 1988-11-04 | 1990-07-26 | Mats Linger | Safety guard beam light switch |
SE463948B (en) * | 1989-12-13 | 1991-02-11 | Gunnar Widell | SET AND DEVICE FOR MONITORING OF AUTOMATIC PRODUCTION EQUIPMENT |
-
1993
- 1993-11-16 SE SE9303785A patent/SE502306C2/en not_active IP Right Cessation
-
1994
- 1994-11-16 EP EP95901663A patent/EP0729400B1/en not_active Expired - Lifetime
- 1994-11-16 AU AU10810/95A patent/AU1081095A/en not_active Abandoned
- 1994-11-16 DE DE69412280T patent/DE69412280T2/en not_active Expired - Fee Related
- 1994-11-16 WO PCT/SE1994/001079 patent/WO1995013906A1/en active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
SE502306C2 (en) | 1995-10-02 |
SE9303785L (en) | 1995-05-17 |
EP0729400A1 (en) | 1996-09-04 |
DE69412280D1 (en) | 1998-09-10 |
AU1081095A (en) | 1995-06-06 |
SE9303785D0 (en) | 1993-11-16 |
WO1995013906A1 (en) | 1995-05-26 |
DE69412280T2 (en) | 1998-12-17 |
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